EventExample App

This is example code for my [medium article] about events in React-native, including various examples on how to use events to communicate from native to Javascript, or between different Javascript components.

Use react-native run-android to run the app.

note: the native code parts are intended for android only, Xcode snippets can be found on the official website.

Java to Javascript

Code for the custom android module can be found in android/app/src/main/java/com/javatojs. Do not forget to add your custom package in MainApplication.java.

The javascript end is stored in app/components/javatojs. Note that DeviceEventEmitter has been used directly there, but could have been replaced with an instance of NativeEventEmitter (or of a class extending it).

Javascript to javascript

Code is hosted in app/components/jstojs. Basically, although DeviceEventEmitter can be used directly, the recommended way to proceed involves instantiating NativeEventEmitter.

Be careful that for a given event name, events emitted in any instance of NativeEventEmitter can be caught by any other instance! This is illustrated in the example app: altough BasicEventEmitter calls emit directly on the DeviceEventEmitter, CustomEventEmitter will catch it too if a subscription has been made.